J. Staczek et al., PURIFICATION FROM HUMAN PLASMA OF A TETRAPEPTIDE THAT POTENTIATES INSULIN-LIKE GROWTH-FACTOR-I ACTIVITY IN CHICK-EMBRYO CARTILAGE, FEBS letters, 373(3), 1995, pp. 207-211
Human plasma has been shown to contain a low molecular weight factor t
hat potentiates human IGF-I stimulation of glycosaminoglycan synthesis
in chick embryo cartilage. The peptide was purified and characterized
by Edman degradation and electrospray mass spectrometry. The primary
structure determined was: Trp-Gly-His-Glu. A homologous synthetic pept
ide similarly promoted matrix biosynthesis in cartilage exposed to IGF
-I.